Very interesting engine!
I'd say it was a replacement short block for a 64 GTO? car.
I think that a dealer would/should stamp the replacement engine with the original EUN/code?
That engine is actually a Nov 1965 block which they were probably making engines for 1966 model year.
Looks like that eun would be around a 03D car in 1964.
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John Wallace - johnta1
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